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import sys, time
from django.conf import settings
from django.db import connection, transaction, backend
from django.core import management
from django.dispatch import dispatcher
from django.test import signals
from django.template import Template
# The prefix to put on the default database name when creating
# the test database.
TEST_DATABASE_PREFIX = 'test_'
def instrumented_test_render(self, context):
"""An instrumented Template render method, providing a signal
that can be intercepted by the test system Client
"""
dispatcher.send(signal=signals.template_rendered, sender=self, template=self, context=context)
return self.nodelist.render(context)
def setup_test_environment():
"""Perform any global pre-test setup. This involves:
- Installing the instrumented test renderer
"""
Template.original_render = Template.render
Template.render = instrumented_test_render
def teardown_test_environment():
"""Perform any global post-test teardown. This involves:
- Restoring the original test renderer
"""
Template.render = Template.original_render
del Template.original_render
def _set_autocommit(connection):
"Make sure a connection is in autocommit mode."
if hasattr(connection.connection, "autocommit"):
connection.connection.autocommit(True)
elif hasattr(connection.connection, "set_isolation_level"):
connection.connection.set_isolation_level(0)
def create_test_db(verbosity=1, autoclobber=False):
if verbosity >= 1:
print "Creating test database..."
# If we're using SQLite, it's more convenient to test against an
# in-memory database.
if settings.DATABASE_ENGINE == "sqlite3":
TEST_DATABASE_NAME = ":memory:"
else:
if settings.TEST_DATABASE_NAME:
TEST_DATABASE_NAME = settings.TEST_DATABASE_NAME
else:
TEST_DATABASE_NAME = TEST_DATABASE_PREFIX + settings.DATABASE_NAME
# Create the test database and connect to it. We need to autocommit
# if the database supports it because PostgreSQL doesn't allow
# CREATE/DROP DATABASE statements within transactions.
cursor = connection.cursor()
_set_autocommit(connection)
try:
cursor.execute("CREATE DATABASE %s" % backend.quote_name(TEST_DATABASE_NAME))
except Exception, e:
sys.stderr.write("Got an error creating the test database: %s\n" % e)
if not autoclobber:
confirm = raw_input("It appears the test database, %s, already exists. Type 'yes' to delete it, or 'no' to cancel: " % TEST_DATABASE_NAME)
if autoclobber or confirm == 'yes':
try:
if verbosity >= 1:
print "Destroying old test database..."
cursor.execute("DROP DATABASE %s" % backend.quote_name(TEST_DATABASE_NAME))
if verbosity >= 1:
print "Creating test database..."
cursor.execute("CREATE DATABASE %s" % backend.quote_name(TEST_DATABASE_NAME))
except Exception, e:
sys.stderr.write("Got an error recreating the test database: %s\n" % e)
sys.exit(2)
else:
print "Tests cancelled."
sys.exit(1)
connection.close()
settings.DATABASE_NAME = TEST_DATABASE_NAME
management.syncdb(verbosity, interactive=False)
# Get a cursor (even though we don't need one yet). This has
# the side effect of initializing the test database.
cursor = connection.cursor()
def destroy_test_db(old_database_name, verbosity=1):
# Unless we're using SQLite, remove the test database to clean up after
# ourselves. Connect to the previous database (not the test database)
# to do so, because it's not allowed to delete a database while being
# connected to it.
if verbosity >= 1:
print "Destroying test database..."
connection.close()
TEST_DATABASE_NAME = settings.DATABASE_NAME
settings.DATABASE_NAME = old_database_name
if settings.DATABASE_ENGINE != "sqlite3":
cursor = connection.cursor()
_set_autocommit(connection)
time.sleep(1) # To avoid "database is being accessed by other users" errors.
cursor.execute("DROP DATABASE %s" % backend.quote_name(TEST_DATABASE_NAME))
connection.close()
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